US5142395A - Liquid crystal display with spacers of specific densities which are adhesive and elastic - Google Patents
Liquid crystal display with spacers of specific densities which are adhesive and elastic Download PDFInfo
- Publication number
- US5142395A US5142395A US07/503,517 US50351790A US5142395A US 5142395 A US5142395 A US 5142395A US 50351790 A US50351790 A US 50351790A US 5142395 A US5142395 A US 5142395A
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- United States
- Prior art keywords
- spacers
- substrates
- liquid crystal
- fusible
- pair
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13392—Gaskets; Spacers; Sealing of cells spacers dispersed on the cell substrate, e.g. spherical particles, microfibres
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
An improved liquid crystal device is described. The distance between a pair of substrates is kept constant by means of spacers interposed therebetween. The spacers consist of two kinds of spacers. One kind of spacers is fusable and functions to prevent the distance from expanding. The other kind of spacers is non-fusable and functions to prevent the distance from contracting.
Description
This is a divisional application of Ser. No. 260,605, filed Oct. 21, 1988, now U.S. Pat. No. 4,973,138.
The present invention relates to a liquid crystal device and manufacturing method for the same.
In recent years, ferroelectric liquid crystal materials have attracted the interest of researchers due to their quasi-hysteresis characteristics. The performance of this type liquid crystal device depends largely on the distance between a pair of substrates in which liquid crystal material is disposed. If there is substantial disparity in distance between the substrates, the response times of respective constituent cell elements are dispersed, and degradation of display performance and irregular color result.
It is an object of the present invention to provide a liquid crystal device in which a liquid crystal layer is formed with a constant thickness.
It is another object of the present invention to provide a method of manufacturing liquid crystal devices without causing coming-off of spacers which function to maintain the distant between a pair of substrates constant, and without causing the occurance of void spaces in a liquid crystal layer formed between the pair of substrates.
FIG. 1 is a cross sectional view showing a liquid crystal device in accordance with the present invention.
FIG. 2 is a diagram showing the points of a liquid crystal device at which distances were measured in order to evaluate the disparity of the substrate gap of the liquid crystal device in accordance with the present invention.
FIG. 3 is a schematic diagram showing an apparatus for disposing a liquid crystal material between a pair of substrates of a liquid crystal device.
Referring now to FIG. 1, a liquid crystal display is illustrated in accordance with the present invention. In the figure, the display comprises a pair of 310 mm×220 mm glass substrates 1, transparent electrode arrangements 2 formed on the opposed insides of the substrates 1 by a known sputtering, orientation control films made of polyimide covering the inside surfaces of the substrates over the electrode arrangement, fusible spacers 5 and non-fusible spacers 4 both interposed between the substrates 1, a sealing member 7 for preventing the loss of liquid crystal material and a liquid crytal layer 9 made of a ferroelectric liquid crystal material disposed between the substrates 1. For operation, crossed Nicols 8 are placed on the both external sides of the displays. The electrode arrangements are provided with two sets of parallel electrode strips in an orthgonal relationship by a known photolithography. Adjacent strips are spaced by distances of 20 microns. Generally speaking, the average diameter of the fusible spacers is 3-5 times larger than that of the non-fusible spacers.
The non-fusible spacers 4 are made of a plurality of segments of a glass fiber. The fusible spacers 5 are made of plurality of epoxy particles of 5.5 micron diameter (Toraypearl, a trademark of spacers manufactured by Toray Co.). The spacers 4 and 5 are distributed between the substrates 1 by the following procedure. Glass fiber segments of 2.5 microns average diameter and 10 microns average length are mixed with a freon (CFCl2) at 2 gram/liter and sufficiently dispersed by applying ultrasonic vibration. The dispersed fiber freon mixture is sprayed on the surface of a glass substrate. In the same way, the epoxy particles are mixed with and dispersed in freon at a proportion of 1.0 gram/liter, and distributed on the surface of the substrate. On the other hand, an opposed glass substrate is provided at the periphery thereof with a sealing member of a thermosetting resin such as an epoxy adhesive by screen press printing. The two substrates are joined and heated at 180° C. for two hours under a pressure of 2 Kg/cm2 in order to fix the fusible spacers 5 and the sealing member 7. Then, an amount of ferroelectric liquid crystal material (CS-1011 manufactured by Tisso Co.) is interposed between the substrates by vacuum charging method.
By virtue of the two kinds of spacers, the distance between the substrates is maintained constant. The fusible spacers prohibit the expansion of the distance while the non-fusible spacers prohibit the contraction of the distance. In this description, "non-fusible" is also meant "non-contracting."
The distributed densities of these spacers are controlled by adjusting the spraying time. Average distance (gap) in microns and standard deviation (S.D.) were measured in cases with varied densities of spacers 4 and 5. Following are experimental results.
______________________________________ Density Density Average Sample (spacer 5) (spacer 4) Gap (u) S. D. Defects ______________________________________ A 50-100 10-15 2.45 0.50 few B 100-150 10-15 2.49 0.01 few C 150-200 10-15 2.53 0.09 much D 100-150 1-5 2.45 0.20 few E 100-150 20-25 2.55 0.05 much ______________________________________
As shown in the above results, samples B and D were good devices. Particularly, sample B was confirmed to have a uniform substrate gap, few defects and little irregular color. Although a glass fiber is used to make the non-fusible spacers in this embodiment, alumina or suitable organic material can be used instead.
Next, a second embodiment will be described. This embodiment is suitable for the case that the main problem is void spaces which occur in the liquid crystal layer because of the contraction of the liquid crystal material ensuing from cooling completion of liquid crystal disposing. In this case, it is undesired to perfectly prohibit the change of the distance between the pair of substrates. The liquid crystal layer contracts due to the differential temperature during manufacture, and if the distance change is impossible by virtue of the spacers, void spaces have to occur in the layer to compensate the contraction of the liquid crystal material. In turn, the liquid crystal layer urges the distance between the pair of substrates to increase during disposing process thereof.
The spacers used for the second embodiment are made of a resilient fusible material which allows contraction and expansion to some extent. The construction and the manufacturing process are substantially same as those of the first embodiment. Uniformity of the distance between the substrates and the orientation of liquid crystal material were evaluated with varied densities (/mm2) of spacers. Followings are the experimental results.
______________________________________ Density of Uniformity Orientation of Sample Spacers of Distance liquid crystal ______________________________________ 1 1.2 bad good 2 2.8 not so good good 3 3.1 good good 4 4.5 good good 5 6.9 good good 6 9.1 good good 7 12.1 good good 8 14.8 good good 9 15.5 not so good good 10 17.3 not so good not so good 11 19.5 bad not so good ______________________________________
In case of sample 1, spacers came off from the surface of the substrate during disposing of liquid crystal into the space between the pair of substrates and eventually the distance became unequal. Sample 2 followed suit but the number of coming-off spacers was smaller than that of the sample 1. In samples 9, 10 and 11, the distances were increased. In samples 10 and 11, the orientation of liquid crystal was disturbed. Followings are data of the distances measured in microns at the points as shown in FIG. 2 for samples 1, 5 and 10. Accordingly, the desirable density of spacers is 3 to 15 mm-2.
______________________________________ Point Sample 1Sample 5 Sample 10 ______________________________________ A 2.4 2.1 2.3 B 2.6 2.2 2.4 C 2.5 2.2 2.4 D 2.4 2.1 2.6 E 3.2 2.2 2.7 F 3.0 2.3 2.9 G 2.9 2.2 2.9 H 3.1 2.3 2.8 I 3.0 2.2 2.5 J 2.7 2.2 2.3 K 2.5 2.2 2.4 L 2.3 2.1 2.3 ______________________________________
The conspicuous difference between the first and the second embodiments is the number of the spacers. The spacer 5 of the first embodiment is such that no expansion is allowed, and therefore coming-off of the spacers is very likely and eventually the number of the spacers must be increased. In case of the second embodiment, the spacers can absorb the expansion of the distance between the substrates and therefore the neccessary number of the spacers is small.
Uniformity and void spaces were evaluated in cases with varied degrees of elasticity of the spacers. The results are as below.
______________________________________ Degree of Sample Elasticity Uniformity Void Space ______________________________________ 1 5.0 (%)good exist 2 8.3good exist 3 11.4good none 4 18.4good none 5 22.5good none 6 30.2 good none 7 33.7 good none 8 36.4 not sogood none 9 40.5 bad none 10 48.3 bad none ______________________________________
From the above results, the preferred degree of elasticity ranges from 10% to 35%. Samples 8, 9 and 10 were not acceptable because of expansion of the distance due to the high degrees of elasticity. Followings are data of the distances measured in microns at the points as shown in FIG. 2 for samples 1, 5 and 10.
______________________________________ Point Sample 1Sample 5 Sample 10 ______________________________________ A 2.1 2.1 2.2 B 2.9 2.2 2.5 C 2.1 2.3 2.4 D 2.2 2.3 2.6 E 2.1 2.3 2.8 F 2.1 2.2 3.0 G 2.2 2.2 2.8 H 2.1 2.1 2.7 I 2.0 2.2 2.7 J 2.1 2.3 3.0 K 2.1 2.2 2.7 L 2.2 2.2 2.4 ______________________________________
In practice, spacers having varied degrees of elasticity can be prepared by making combination use of a mixture of plural kinds of spacers having different degrees of elasticity. For instance, an effective 27.5% degree is obtained by use of first spacers of 5% degree and second spacers of 50% degree at 1:1 proportion. Followings are data of the distances measured in microns at the points as shown in FIG. 2 in cases with the combination use, the use of the first spacers only and the use of second spacers only.
______________________________________ Point Combination First Spacer Second Spacer ______________________________________ A 2.1 2.0 2.2 B 2.1 2.1 2.4 C 2.2 2.0 2.5 D 2.1 2.1 2.9 E 2.2 2.1 2.8 F 2.1 2.0 2.5 G 2.2 2.0 2.7 H 2.1 2.0 2.6 I 2.2 2.1 2.4 J 2.2 2.0 2.5 K 2.1 2.1 2.3 L 2.2 2.0 2.5 ______________________________________
The expansion of the mated substrate and ensuing excess charge of liquid crystal material can be avoided by employing the following method for disposing liquid crystal material.
FIG. 3 is a schematic diagram showing an apparatus for disposing liquid crytal material between a pair of substrates of liquid crystal device. The apparatus comprises a vacuum chamber 10, a vacuum pump 19 for evacuating the vacuum chamber, a press 12 equipped with torque screws 15, a pair of plates 12 and 14 having opposed smooth inside surfaces which are finely oriented parallel with each other, an accumlator 7 containing liquid crystal material therein and adapted to pour the liquid crystal material into the space between the pair of substrates and a heater 16 located just below the plate 14.
A liquid crystal device in advance of disposing procedure is placed between the pair of plates 12 and 14 and pressed by rotating the torque screws 15 at 1 Kg/cm2. In this condition, the pressure in the chamber 10 is reduced by the vacuum pump 19 to 1×10-4 Torr. The temperature of the device is elevated at the same time to 150° C. by means of the heater. Then, an amount of liquid crystal material such as a ferroelectric liquid crystal is poured into an inlet port provided at the periphery of the liquid crystal device, and the pressure in the chamber is returned to an atmospheric pressure by leaking N2 gas thereinto at 20 cc/min. Followings are data of the distances measured in microns at the points as shown in FIG. 2 in cases that liquid crystal is disposed into the liquid crystal device with and without application of a pressure and without a pressure.
______________________________________ Point Pressed Device Non-pressed Device ______________________________________ A 2.1 2.0 B 2.4 2.0 C 2.1 2.1 D 2.2 2.1 E 3.4 2.0 F 2.2 2.0 G 2.2 2.1 H 3.5 2.1 I 2.2 2.0 J 2.1 2.0 K 2.4 2.0 L 2.1 2.1 ______________________________________
The present invention is effective particularly when used in ferroelectric liquid crystal devices. In the liquid crystal devices of this type, substantial volume change takes place during operation and the operational life time is greatly dependent of the resistance to the volume change which may appear in the form of microvibrations. The use of spacers made of a resilient material can absorb such microvibrations. The resilient material may be organic resilient materials or suitable inorganic materials.
While several embodiments have been specifically described, it is to be appreciated that the present invention is not limited to the particular examples described and that modifications and variations can be made without departure from the scope of the invention as defined by the appended claims.
Claims (6)
1. A liquid crystal device comprising:
a pair of substrates;
an electrode arrangement formed on at least one of said substrates;
a plurality of spacers disposed between said pair of substrates in order to maintain a gap between the substrates; and
a liquid crystal layer interposed between said substrates,
wherein said spacers contain fusible spacers and non-fusible spacers and a dispersion density of said non-fusible spacers is 1-15 particles/mm2 and wherein a dispersion density of said fusible spacer is 50-150 particles/mm2.
2. The liquid crystal device of claim 1, wherein said non-fusible spacers are made of glass fibers.
3. The liquid crystal device of claim 1 wherein a diameter of said fusible spacers is 1.5-3 times said non-fusible spacers.
4. A liquid crystal device comprising:
a pair of substrates;
an electrode arrangement formed on the inside surfaces of the pair of substrates;
a liquid crystal layer disposed between said substrates; and
a plurality of spacers distributed between said substrates in order to maintain the distance between said substrates constant wherein the distribution density of said spacers is 3 to 15 mm-2,
wherein said spacers are made of a resilient material having adhesivity and wherein said spacers consist of plural kinds of spacers having different degrees of elasticity.
5. An electro-optical liquid crystal device comprising:
a pair of substrates;
an electrode arrangement formed on the inside surfaces of the pair of substrates;
a ferroelectric liquid crystal layer disposed between said substrates; and
a plurality of spacers distributed between said substrates in order to maintain the distance between said substrates constant;
wherein said spacers are made of a resilient material having adhesivity and have an elasticity of 10-35%.
6. The device of claim 5 wherein the distribution density of said spacers is 3 to 15 mm-2.
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27088687A JPH01113729A (en) | 1987-10-27 | 1987-10-27 | Liquid crystal electro-optic device |
JP62-270886 | 1987-10-27 | ||
JP63-239260 | 1988-09-22 | ||
JP63-239258 | 1988-09-22 | ||
JP63-239259 | 1988-09-22 | ||
JP23925888A JPH0287120A (en) | 1988-09-22 | 1988-09-22 | Liquid crystal element |
JP23926088A JPH0287114A (en) | 1988-09-22 | 1988-09-22 | Injecting method for light crystal cell |
JP63239259A JP2893069B2 (en) | 1988-09-22 | 1988-09-22 | Liquid crystal element |
JP24175088A JPH0289026A (en) | 1988-09-26 | 1988-09-26 | Liquid crystal element |
JP63-241750 | 1988-09-26 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/260,605 Division US4973138A (en) | 1987-10-27 | 1988-10-21 | Liquid crystal device and manufacturing method for the same |
Publications (1)
Publication Number | Publication Date |
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US5142395A true US5142395A (en) | 1992-08-25 |
Family
ID=27530012
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/260,605 Expired - Fee Related US4973138A (en) | 1987-10-27 | 1988-10-21 | Liquid crystal device and manufacturing method for the same |
US07/503,517 Expired - Lifetime US5142395A (en) | 1987-10-27 | 1990-03-23 | Liquid crystal display with spacers of specific densities which are adhesive and elastic |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/260,605 Expired - Fee Related US4973138A (en) | 1987-10-27 | 1988-10-21 | Liquid crystal device and manufacturing method for the same |
Country Status (3)
Country | Link |
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US (2) | US4973138A (en) |
EP (1) | EP0314048B2 (en) |
DE (1) | DE3855344T3 (en) |
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US5231527A (en) * | 1991-02-01 | 1993-07-27 | Sharp Kabushiki Kaisha | Liquid crystal display with spacer having elastic modulus in compression of 370-550 kg/mm2 at 10% displacement of diameter |
US5486941A (en) * | 1990-09-29 | 1996-01-23 | Sekisui Fine Chemical Co., Ltd. | Fine sphere, a spherical spacer for a liquid crystal display element and a liquid display element using the same |
US5578404A (en) * | 1995-03-27 | 1996-11-26 | Polaroid Corporation | Process for the production of liquid crystal display |
US5618912A (en) * | 1995-05-04 | 1997-04-08 | Pennzoil Products Company | Tire sealer and inflator compositions |
US5689314A (en) * | 1995-06-14 | 1997-11-18 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Common path point diffraction interferometer using liquid crystal phase shifting |
US5790223A (en) * | 1992-01-24 | 1998-08-04 | Canon Kabushiki Kaisha | Ferroelectric liquid crystal device and treatment method therefor |
US5838414A (en) * | 1995-12-30 | 1998-11-17 | Samsung Display Devices Co., Ltd. | LCD device with improved resilient adhesive spacers |
US6108068A (en) * | 1998-08-28 | 2000-08-22 | Sony Corporation | Liquid crystal display apparatus using spacers having double structure |
US6307612B1 (en) | 2000-06-08 | 2001-10-23 | Three-Five Systems, Inc. | Liquid crystal display element having a precisely controlled cell gap and method of making same |
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US20030184702A1 (en) * | 1999-12-06 | 2003-10-02 | Sekisui Chemical Co., Ltd | Liquid crystal display and method of manufacturing the same |
US20060017870A1 (en) * | 2004-05-28 | 2006-01-26 | Kyocera Corporation | Liquid crystal display device |
US20060181668A1 (en) * | 2005-02-14 | 2006-08-17 | Chi Mei Optoelectronics Corp. | Liquid crystal display panel |
US20070216848A1 (en) * | 2006-03-17 | 2007-09-20 | Innolux Display Corp. | Method for fabricating liquid crystal panel field of the invention |
US7483673B2 (en) | 2003-11-24 | 2009-01-27 | Seoby Electronics Co., Ltd. | Power line communications using battery devices |
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US5162934A (en) * | 1989-07-31 | 1992-11-10 | Asahi Glass Company Ltd. | Method of manufacturing liquid crystal display element |
US5150239A (en) * | 1990-02-09 | 1992-09-22 | Canon Kabushiki Kaisha | One-pack type epoxy sealant with amine-type curing agent, for liquid crystal cell, display apparatus and recording apparatus |
US6327010B1 (en) | 1992-02-03 | 2001-12-04 | Merck Patent Gesellschaft Mit Beschrankter Haftung | Electrooptical system |
US5285304A (en) * | 1992-01-24 | 1994-02-08 | Canon Kabushiki Kaisha | Ferroelectric liquid crystal device having spacers including the thermosetting adhesive particles and the thermoplastic polymer particles |
US5328728A (en) * | 1992-12-21 | 1994-07-12 | Motorola, Inc. | Process for manufacturing liquid crystal device substrates |
US5477358A (en) * | 1993-06-21 | 1995-12-19 | Case Western Reserve University | Chiral nematic liquid crystal display with homeotropic alignment and negative dielectric anisotropy |
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US6034752A (en) | 1997-03-22 | 2000-03-07 | Kent Displays Incorporated | Display device reflecting visible and infrared radiation |
US5766694A (en) * | 1997-05-29 | 1998-06-16 | Univ Kent State Ohio | Method for forming uniformly-spaced plastic substrate liquid crystal displays |
US5929960A (en) * | 1997-10-17 | 1999-07-27 | Kent State University | Method for forming liquid crystal display cell walls using a patterned electric field |
DE10121177A1 (en) * | 2001-04-30 | 2002-11-14 | Aeg Ges Moderne Inf Sys Mbh | LCD cell |
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JP4543137B2 (en) * | 2004-01-28 | 2010-09-15 | 奇美電子股▲ふん▼有限公司 | Liquid crystal display panel with uniform cell gap |
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US5486941A (en) * | 1990-09-29 | 1996-01-23 | Sekisui Fine Chemical Co., Ltd. | Fine sphere, a spherical spacer for a liquid crystal display element and a liquid display element using the same |
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US5578404A (en) * | 1995-03-27 | 1996-11-26 | Polaroid Corporation | Process for the production of liquid crystal display |
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Also Published As
Publication number | Publication date |
---|---|
DE3855344D1 (en) | 1996-07-11 |
EP0314048A2 (en) | 1989-05-03 |
DE3855344T2 (en) | 1996-10-10 |
EP0314048B2 (en) | 1999-06-16 |
EP0314048B1 (en) | 1996-06-05 |
US4973138A (en) | 1990-11-27 |
EP0314048A3 (en) | 1990-06-13 |
DE3855344T3 (en) | 1999-09-23 |
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